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參數資料
| 型號： | PCDAC12-4 |
| 英文描述： | PC(ISA)BUS I/O CARD |
| 中文描述： | 電腦（ISA）總線的I / O卡 |
| 文件頁數： | 6/16頁 |
| 文件大小： | 266K |
| 代理商： | PCDAC12-4 |
2192-09063-000-000
J260 PCDAC 12-4
Page 6
Operation
Reading or Writing to the Board
Control of the PCO24 is achieved by writing to a
pointer register
and then accessing a
data
register
to read or write the required I/O register. The pointer register need only be written with a
new value if a different register is to be accessed. The board occupies only two bytes of PCbus
I/O space. Each time the board is accessed the red LED will flash momentarily.
Setting a DAC value
The DAC channel is first selected by writing to the pointer register. On this board, unlike other
Arcom ISA boards, the value is then written to two dedicated data registers. The standard function
data register at Base+1 is not used when writing to the DAC’s. DAC data is in binary for uni-polar
operation and offset binary for bi-polar operation.
Special Functions
The PCDAC12-4 has two special function registers, User LED and Board Identifier. After the
pointer register is set, Read/Write Data for either of these registers is addressed to Base+1
I/O Map
A value written to the Pointer register is used to select the Function register, or DAC channel next
to be accessed.
This board occupies four consecutive addresses and must be set to an address which is a multiple
of 4. (e.g. 180h, 184h, 200h)
I/O Function Registers
Address
Base
Base + 1
Base + 2
Base + 3
Write only
Read/write
Write only
Write only
Pointer register
Functions registers
DAC low byte
DAC high byte
Select DAC or data register
On-boarddata/control
LS Data to DAC
MS data to DAC
Read/Write
Register name
Register function
Pointer value
(hex)
0
01
02
03
80
Write
Write
Write
Write
Write
Read
DAC 0
DAC 1
DAC 2
DAC 3
User LED
None
None
None
None
Bit 0 only
Bit 0-7
Board identification
Select DAC 0 for data write
Select DAC 1 for data write
Select DAC 2 for data write
Select DAC 3 for data write
1 = Green LED on
0 = Green LED off
Always 29h for PCDAC12-4
81
Read/Write
Function
Register Name
Data Bit
Function
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